com.google.cloud.hadoop.gcsio.ObjectWriteConditions.java Source code

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Here is the source code for com.google.cloud.hadoop.gcsio.ObjectWriteConditions.java

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/**
 * Copyright 2014 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.cloud.hadoop.gcsio;

import com.google.api.services.storage.Storage.Objects.Insert;
import com.google.common.base.Optional;

/**
 * Conditions on which a object write should be allowed to continue. Corresponds to
 * setting IfGenerationmatch and IfMetaGenerationMatch in API requests.
 */
public class ObjectWriteConditions {

    /**
     * No conditions for completing the write.
     */
    public static final ObjectWriteConditions NONE = new ObjectWriteConditions();

    private final Optional<Long> contentGenerationMatch;
    private final Optional<Long> metaGenerationMatch;

    public ObjectWriteConditions() {
        metaGenerationMatch = Optional.absent();
        contentGenerationMatch = Optional.absent();
    }

    public ObjectWriteConditions(Optional<Long> contentGenerationMatch, Optional<Long> metaGenerationMatch) {
        this.contentGenerationMatch = contentGenerationMatch;
        this.metaGenerationMatch = metaGenerationMatch;
    }

    public boolean hasContentGenerationMatch() {
        return contentGenerationMatch.isPresent();
    }

    public boolean hasMetaGenerationMatch() {
        return metaGenerationMatch.isPresent();
    }

    public long getContentGenerationMatch() {
        return contentGenerationMatch.get();
    }

    public long getMetaGenerationMatch() {
        return metaGenerationMatch.get();
    }

    /**
     * Apply the conditions represented by this object to an Insert operation.
     */
    public void apply(Insert objectToInsert) {
        if (hasContentGenerationMatch()) {
            objectToInsert.setIfGenerationMatch(getContentGenerationMatch());
        }

        if (hasMetaGenerationMatch()) {
            objectToInsert.setIfMetagenerationMatch(getMetaGenerationMatch());
        }
    }
}